Tristan da Cunha

Tristan da Cunha lies in the South Atlantic, about 2,816 km from the nearest mainland, South Africa. The island group comprises Tristan da Cunha and several smaller islands, including Inaccessible, Nightingale and Gough. It is part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha. The only permanent settlement is Edinburgh of the Seven Seas, on the north coast of the main island.

The main island is an active stratovolcano made of layers of lava and pyroclastic material. St Mary’s Peak, its highest point, reaches 2,060 metres. The island has summit and flank volcanic features, including cinder cones and lake-filled depressions called maars, which form when rising magma interacts explosively with underground water.

The most recent eruption described by the British Geological Survey was a dome-forming eruption in 1961–62 near the Settlement. After months of tremors, fissures opened and lava moved toward homes. Residents evacuated and spent two years in Southampton, United Kingdom, before returning. The settlement itself survived, though the eruption damaged nearby infrastructure and land.

Residents live at Edinburgh of the Seven Seas, locally known as the Settlement. Islanders farm and fish, while cargo ships make periodic supply visits. Nearby Gough and Inaccessible Islands form a UNESCO World Heritage site known for relatively undisturbed island and marine ecosystems, major seabird colonies, and endemic plants and animals.